in addition capsules and switched from front line to k 9 add van tix and so he googled the problem and found dozens of other people complaining. >> i'm not a scientist, i'm not a doctor but it seems like you hear a lot of things developing resistance these days so we went to a veterinarian and and. >> we have not been able to demon strait that freeways have become resistant to a product. . >> evidence points to 2012's record warmth and longer growing season. >> getting more fleas earlier and they're lasting longer because the eggs can live outdoors. >> bayer agrees that flea season has been extended. meanwhile the maker of front line says that resistance to the product has not been proven. the doctor suggests you apply the flea medicine o' to the pet's skin, and treat your lawn for insects. this means that pet owners like dean are going to need to be extra individual vigilant all yearlong. >> if you notice a flea or tick issue this spring or summer, see your vet. a change in medication might be all you need that way your pet stays happy. . >> . >> maryland's most accurate forecast..